Leases (Narrative) (Details) $ in Millions |
3 Months Ended |
---|---|
Mar. 31, 2019
USD ($)
| |
Lessee, Lease, Description [Line Items] | |
Lessee, lease, renewal term | 10 years |
Lessee, operating lease, lease not yet commenced, amount | $ 515 |
Lessee, operating lease, lease not yet commenced, renewal term | 10 years |
Minimum | |
Lessee, Lease, Description [Line Items] | |
Lessee, operating lease, lease not yet commenced, term of contract | 2 years |
Maximum | |
Lessee, Lease, Description [Line Items] | |
Lessee, lease, remaining term of contract | 15 years |
Lessee, operating lease, lease not yet commenced, term of contract | 18 years |